THREE-BEAM HOLOGRAPHY

Abstract
A new method of holographic interferometry is proposed, which makes use of three-beam interference for the production of the hologram. A single exposure is then sufficient to produce the hologram from which the interferogram may be reconstructed in the usual manner. In one form, the reconstructed interferogram has double the sensitivity to phase variation as compared to conventional single-pass and double-exposure holographic interferometry. In another form, one may reconstruct the usual interferogram and also the original object wave simultaneously.

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